天然气地球科学 ›› 2020, Vol. 31 ›› Issue (5): 735744.doi: 10.11764/j.issn.1672-1926.2020.04.004
• • 上一篇
熊冉1,2(),郑剑锋1,黄理力1,2,陈永权3,倪新锋1,2
Ran XIONG1,2(),Jian-feng ZHENG1,Li-li HUANG1,2,Yong-quan CHEN3,Xin-feng NI1,2
摘要:
为了更好地表征塔里木盆地肖尔布拉克组碳酸盐岩丘滩复合体的地质地震特征,为预测提供依据,以塔里木盆地西北部柯坪地区28 km长的大尺度露头区为研究对象,通过实测7条剖面,在超过1 000块薄片及56个样品岩石物理采集分析基础上,系统研究了丘滩复合体的岩石类型、内部结构及纵横向展布特征,建立了地震尺度的露头地质模型;以露头地质模型为基础开展地震正演模拟研究,模拟不同频率下丘滩复合体的地震响应,并系统总结其地震反射特征。结果表明:肖尔布拉克组丘滩复合体主要发育于碳酸盐岩缓坡沉积体系的内缓坡,丘主要以黏结结构藻丘和泡沫绵层石丘为主,滩主要以藻砂屑滩为主。地震正演模拟研究结果揭示地震资料的高频成分能表征丘滩体的内部结构及外部形态,丘表现为高频、强振幅、较连续反射,丘状外形,充填结构;滩表现为中—高频,中—强振幅,连续席状反射,内部斜交叠置。通过基于露头地质模型的地震正演模拟揭示的丘滩体地震反射特征,在塔中三维地震区肖尔布拉克组丘滩体地震刻画中取得了较好的效果。
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